Short manual how to install the MQTT server on Ubuntu quickly

1. Install MQTT on Ubuntu

sudo apt-get install mosquitto mosquitto-clients

2. Start MQTT server

sudo /etc/init.d/mosquitto start

3. Start listening on a specific topic

mosquitto_sub -d -t topic_a/subtopic_a

4. Install MQTT on client host machine by issue

sudo apt-get install mosquitto mosquitto-clients

5. Start sending information on a specific topic and IP address

mosquitto_pub -h myaddress.com(xx.xx.xx.xx) -d -t topic_a/subtopic_a -m "Hello World!"

6. The message should be seen on the MQTT server host machine